Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/dev/md/md.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 * $FreeBSD$ 10 * 11 */ 12 13 /*- 14 * The following functions are based in the vn(4) driver: mdstart_swap(), 15 * mdstart_vnode(), mdcreate_swap(), mdcreate_vnode() and mddestroy(), 16 * and as such under the following copyright: 17 * 18 * Copyright (c) 1988 University of Utah. 19 * Copyright (c) 1990, 1993 20 * The Regents of the University of California. All rights reserved. 21 * Copyright (c) 2013 The FreeBSD Foundation 22 * All rights reserved. 23 * 24 * This code is derived from software contributed to Berkeley by 25 * the Systems Programming Group of the University of Utah Computer 26 * Science Department. 27 * 28 * Portions of this software were developed by Konstantin Belousov 29 * under sponsorship from the FreeBSD Foundation. 30 * 31 * Redistribution and use in source and binary forms, with or without 32 * modification, are permitted provided that the following conditions 33 * are met: 34 * 1. Redistributions of source code must retain the above copyright 35 * notice, this list of conditions and the following disclaimer. 36 * 2. Redistributions in binary form must reproduce the above copyright 37 * notice, this list of conditions and the following disclaimer in the 38 * documentation and/or other materials provided with the distribution. 39 * 4. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 * 55 * from: Utah Hdr: vn.c 1.13 94/04/02 56 * 57 * from: @(#)vn.c 8.6 (Berkeley) 4/1/94 58 * From: src/sys/dev/vn/vn.c,v 1.122 2000/12/16 16:06:03 59 */ 60 61 #include "opt_geom.h" 62 #include "opt_md.h" 63 64 #include <sys/param.h> 65 #include <sys/systm.h> 66 #include <sys/bio.h> 67 #include <sys/buf.h> 68 #include <sys/conf.h> 69 #include <sys/devicestat.h> 70 #include <sys/fcntl.h> 71 #include <sys/kernel.h> 72 #include <sys/kthread.h> 73 #include <sys/limits.h> 74 #include <sys/linker.h> 75 #include <sys/lock.h> 76 #include <sys/malloc.h> 77 #include <sys/mdioctl.h> 78 #include <sys/mount.h> 79 #include <sys/mutex.h> 80 #include <sys/sx.h> 81 #include <sys/namei.h> 82 #include <sys/proc.h> 83 #include <sys/queue.h> 84 #include <sys/sbuf.h> 85 #include <sys/sched.h> 86 #include <sys/sf_buf.h> 87 #include <sys/sysctl.h> 88 #include <sys/vnode.h> 89 90 #include <geom/geom.h> 91 #include <geom/geom_int.h> 92 93 #include <vm/vm.h> 94 #include <vm/vm_param.h> 95 #include <vm/vm_object.h> 96 #include <vm/vm_page.h> 97 #include <vm/vm_pager.h> 98 #include <vm/swap_pager.h> 99 #include <vm/uma.h> 100 101 #define MD_MODVER 1 102 103 #define MD_SHUTDOWN 0x10000 /* Tell worker thread to terminate. */ 104 #define MD_EXITING 0x20000 /* Worker thread is exiting. */ 105 106 #ifndef MD_NSECT 107 #define MD_NSECT (10000 * 2) 108 #endif 109 110 static MALLOC_DEFINE(M_MD, "md_disk", "Memory Disk"); 111 static MALLOC_DEFINE(M_MDSECT, "md_sectors", "Memory Disk Sectors"); 112 113 static int md_debug; 114 SYSCTL_INT(_debug, OID_AUTO, mddebug, CTLFLAG_RW, &md_debug, 0, ""); 115 static int md_malloc_wait; 116 SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0, ""); 117 118 #if defined(MD_ROOT) && defined(MD_ROOT_SIZE) 119 /* 120 * Preloaded image gets put here. 121 * Applications that patch the object with the image can determine 122 * the size looking at the start and end markers (strings), 123 * so we want them contiguous. 124 */ 125 static struct { 126 u_char start[MD_ROOT_SIZE*1024]; 127 u_char end[128]; 128 } mfs_root = { 129 .start = "MFS Filesystem goes here", 130 .end = "MFS Filesystem had better STOP here", 131 }; 132 #endif 133 134 static g_init_t g_md_init; 135 static g_fini_t g_md_fini; 136 static g_start_t g_md_start; 137 static g_access_t g_md_access; 138 static void g_md_dumpconf(struct sbuf *sb, const char *indent, 139 struct g_geom *gp, struct g_consumer *cp __unused, struct g_provider *pp); 140 141 static struct cdev *status_dev = 0; 142 static struct sx md_sx; 143 static struct unrhdr *md_uh; 144 145 static d_ioctl_t mdctlioctl; 146 147 static struct cdevsw mdctl_cdevsw = { 148 .d_version = D_VERSION, 149 .d_ioctl = mdctlioctl, 150 .d_name = MD_NAME, 151 }; 152 153 struct g_class g_md_class = { 154 .name = "MD", 155 .version = G_VERSION, 156 .init = g_md_init, 157 .fini = g_md_fini, 158 .start = g_md_start, 159 .access = g_md_access, 160 .dumpconf = g_md_dumpconf, 161 }; 162 163 DECLARE_GEOM_CLASS(g_md_class, g_md); 164 165 166 static LIST_HEAD(, md_s) md_softc_list = LIST_HEAD_INITIALIZER(md_softc_list); 167 168 #define NINDIR (PAGE_SIZE / sizeof(uintptr_t)) 169 #define NMASK (NINDIR-1) 170 static int nshift; 171 172 static int md_vnode_pbuf_freecnt; 173 174 struct indir { 175 uintptr_t *array; 176 u_int total; 177 u_int used; 178 u_int shift; 179 }; 180 181 struct md_s { 182 int unit; 183 LIST_ENTRY(md_s) list; 184 struct bio_queue_head bio_queue; 185 struct mtx queue_mtx; 186 struct cdev *dev; 187 enum md_types type; 188 off_t mediasize; 189 unsigned sectorsize; 190 unsigned opencount; 191 unsigned fwheads; 192 unsigned fwsectors; 193 unsigned flags; 194 char name[20]; 195 struct proc *procp; 196 struct g_geom *gp; 197 struct g_provider *pp; 198 int (*start)(struct md_s *sc, struct bio *bp); 199 struct devstat *devstat; 200 201 /* MD_MALLOC related fields */ 202 struct indir *indir; 203 uma_zone_t uma; 204 205 /* MD_PRELOAD related fields */ 206 u_char *pl_ptr; 207 size_t pl_len; 208 209 /* MD_VNODE related fields */ 210 struct vnode *vnode; 211 char file[PATH_MAX]; 212 struct ucred *cred; 213 214 /* MD_SWAP related fields */ 215 vm_object_t object; 216 }; 217 218 static struct indir * 219 new_indir(u_int shift) 220 { 221 struct indir *ip; 222 223 ip = malloc(sizeof *ip, M_MD, (md_malloc_wait ? M_WAITOK : M_NOWAIT) 224 | M_ZERO); 225 if (ip == NULL) 226 return (NULL); 227 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 228 M_MDSECT, (md_malloc_wait ? M_WAITOK : M_NOWAIT) | M_ZERO); 229 if (ip->array == NULL) { 230 free(ip, M_MD); 231 return (NULL); 232 } 233 ip->total = NINDIR; 234 ip->shift = shift; 235 return (ip); 236 } 237 238 static void 239 del_indir(struct indir *ip) 240 { 241 242 free(ip->array, M_MDSECT); 243 free(ip, M_MD); 244 } 245 246 static void 247 destroy_indir(struct md_s *sc, struct indir *ip) 248 { 249 int i; 250 251 for (i = 0; i < NINDIR; i++) { 252 if (!ip->array[i]) 253 continue; 254 if (ip->shift) 255 destroy_indir(sc, (struct indir*)(ip->array[i])); 256 else if (ip->array[i] > 255) 257 uma_zfree(sc->uma, (void *)(ip->array[i])); 258 } 259 del_indir(ip); 260 } 261 262 /* 263 * This function does the math and allocates the top level "indir" structure 264 * for a device of "size" sectors. 265 */ 266 267 static struct indir * 268 dimension(off_t size) 269 { 270 off_t rcnt; 271 struct indir *ip; 272 int layer; 273 274 rcnt = size; 275 layer = 0; 276 while (rcnt > NINDIR) { 277 rcnt /= NINDIR; 278 layer++; 279 } 280 281 /* 282 * XXX: the top layer is probably not fully populated, so we allocate 283 * too much space for ip->array in here. 284 */ 285 ip = malloc(sizeof *ip, M_MD, M_WAITOK | M_ZERO); 286 ip->array = malloc(sizeof(uintptr_t) * NINDIR, 287 M_MDSECT, M_WAITOK | M_ZERO); 288 ip->total = NINDIR; 289 ip->shift = layer * nshift; 290 return (ip); 291 } 292 293 /* 294 * Read a given sector 295 */ 296 297 static uintptr_t 298 s_read(struct indir *ip, off_t offset) 299 { 300 struct indir *cip; 301 int idx; 302 uintptr_t up; 303 304 if (md_debug > 1) 305 printf("s_read(%jd)\n", (intmax_t)offset); 306 up = 0; 307 for (cip = ip; cip != NULL;) { 308 if (cip->shift) { 309 idx = (offset >> cip->shift) & NMASK; 310 up = cip->array[idx]; 311 cip = (struct indir *)up; 312 continue; 313 } 314 idx = offset & NMASK; 315 return (cip->array[idx]); 316 } 317 return (0); 318 } 319 320 /* 321 * Write a given sector, prune the tree if the value is 0 322 */ 323 324 static int 325 s_write(struct indir *ip, off_t offset, uintptr_t ptr) 326 { 327 struct indir *cip, *lip[10]; 328 int idx, li; 329 uintptr_t up; 330 331 if (md_debug > 1) 332 printf("s_write(%jd, %p)\n", (intmax_t)offset, (void *)ptr); 333 up = 0; 334 li = 0; 335 cip = ip; 336 for (;;) { 337 lip[li++] = cip; 338 if (cip->shift) { 339 idx = (offset >> cip->shift) & NMASK; 340 up = cip->array[idx]; 341 if (up != 0) { 342 cip = (struct indir *)up; 343 continue; 344 } 345 /* Allocate branch */ 346 cip->array[idx] = 347 (uintptr_t)new_indir(cip->shift - nshift); 348 if (cip->array[idx] == 0) 349 return (ENOSPC); 350 cip->used++; 351 up = cip->array[idx]; 352 cip = (struct indir *)up; 353 continue; 354 } 355 /* leafnode */ 356 idx = offset & NMASK; 357 up = cip->array[idx]; 358 if (up != 0) 359 cip->used--; 360 cip->array[idx] = ptr; 361 if (ptr != 0) 362 cip->used++; 363 break; 364 } 365 if (cip->used != 0 || li == 1) 366 return (0); 367 li--; 368 while (cip->used == 0 && cip != ip) { 369 li--; 370 idx = (offset >> lip[li]->shift) & NMASK; 371 up = lip[li]->array[idx]; 372 KASSERT(up == (uintptr_t)cip, ("md screwed up")); 373 del_indir(cip); 374 lip[li]->array[idx] = 0; 375 lip[li]->used--; 376 cip = lip[li]; 377 } 378 return (0); 379 } 380 381 382 static int 383 g_md_access(struct g_provider *pp, int r, int w, int e) 384 { 385 struct md_s *sc; 386 387 sc = pp->geom->softc; 388 if (sc == NULL) { 389 if (r <= 0 && w <= 0 && e <= 0) 390 return (0); 391 return (ENXIO); 392 } 393 r += pp->acr; 394 w += pp->acw; 395 e += pp->ace; 396 if ((sc->flags & MD_READONLY) != 0 && w > 0) 397 return (EROFS); 398 if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 399 sc->opencount = 1; 400 } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 401 sc->opencount = 0; 402 } 403 return (0); 404 } 405 406 static void 407 g_md_start(struct bio *bp) 408 { 409 struct md_s *sc; 410 411 sc = bp->bio_to->geom->softc; 412 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) 413 devstat_start_transaction_bio(sc->devstat, bp); 414 mtx_lock(&sc->queue_mtx); 415 bioq_disksort(&sc->bio_queue, bp); 416 mtx_unlock(&sc->queue_mtx); 417 wakeup(sc); 418 } 419 420 #define MD_MALLOC_MOVE_ZERO 1 421 #define MD_MALLOC_MOVE_FILL 2 422 #define MD_MALLOC_MOVE_READ 3 423 #define MD_MALLOC_MOVE_WRITE 4 424 #define MD_MALLOC_MOVE_CMP 5 425 426 static int 427 md_malloc_move(vm_page_t **mp, int *ma_offs, unsigned sectorsize, 428 void *ptr, u_char fill, int op) 429 { 430 struct sf_buf *sf; 431 vm_page_t m, *mp1; 432 char *p, first; 433 off_t *uc; 434 unsigned n; 435 int error, i, ma_offs1, sz, first_read; 436 437 m = NULL; 438 error = 0; 439 sf = NULL; 440 /* if (op == MD_MALLOC_MOVE_CMP) { gcc */ 441 first = 0; 442 first_read = 0; 443 uc = ptr; 444 mp1 = *mp; 445 ma_offs1 = *ma_offs; 446 /* } */ 447 sched_pin(); 448 for (n = sectorsize; n != 0; n -= sz) { 449 sz = imin(PAGE_SIZE - *ma_offs, n); 450 if (m != **mp) { 451 if (sf != NULL) 452 sf_buf_free(sf); 453 m = **mp; 454 sf = sf_buf_alloc(m, SFB_CPUPRIVATE | 455 (md_malloc_wait ? 0 : SFB_NOWAIT)); 456 if (sf == NULL) { 457 error = ENOMEM; 458 break; 459 } 460 } 461 p = (char *)sf_buf_kva(sf) + *ma_offs; 462 switch (op) { 463 case MD_MALLOC_MOVE_ZERO: 464 bzero(p, sz); 465 break; 466 case MD_MALLOC_MOVE_FILL: 467 memset(p, fill, sz); 468 break; 469 case MD_MALLOC_MOVE_READ: 470 bcopy(ptr, p, sz); 471 cpu_flush_dcache(p, sz); 472 break; 473 case MD_MALLOC_MOVE_WRITE: 474 bcopy(p, ptr, sz); 475 break; 476 case MD_MALLOC_MOVE_CMP: 477 for (i = 0; i < sz; i++, p++) { 478 if (!first_read) { 479 *uc = (u_char)*p; 480 first = *p; 481 first_read = 1; 482 } else if (*p != first) { 483 error = EDOOFUS; 484 break; 485 } 486 } 487 break; 488 default: 489 KASSERT(0, ("md_malloc_move unknown op %d\n", op)); 490 break; 491 } 492 if (error != 0) 493 break; 494 *ma_offs += sz; 495 *ma_offs %= PAGE_SIZE; 496 if (*ma_offs == 0) 497 (*mp)++; 498 ptr = (char *)ptr + sz; 499 } 500 501 if (sf != NULL) 502 sf_buf_free(sf); 503 sched_unpin(); 504 if (op == MD_MALLOC_MOVE_CMP && error != 0) { 505 *mp = mp1; 506 *ma_offs = ma_offs1; 507 } 508 return (error); 509 } 510 511 static int 512 mdstart_malloc(struct md_s *sc, struct bio *bp) 513 { 514 u_char *dst; 515 vm_page_t *m; 516 int i, error, error1, ma_offs, notmapped; 517 off_t secno, nsec, uc; 518 uintptr_t sp, osp; 519 520 switch (bp->bio_cmd) { 521 case BIO_READ: 522 case BIO_WRITE: 523 case BIO_DELETE: 524 break; 525 default: 526 return (EOPNOTSUPP); 527 } 528 529 notmapped = (bp->bio_flags & BIO_UNMAPPED) != 0; 530 if (notmapped) { 531 m = bp->bio_ma; 532 ma_offs = bp->bio_ma_offset; 533 dst = NULL; 534 } else { 535 dst = bp->bio_data; 536 } 537 538 nsec = bp->bio_length / sc->sectorsize; 539 secno = bp->bio_offset / sc->sectorsize; 540 error = 0; 541 while (nsec--) { 542 osp = s_read(sc->indir, secno); 543 if (bp->bio_cmd == BIO_DELETE) { 544 if (osp != 0) 545 error = s_write(sc->indir, secno, 0); 546 } else if (bp->bio_cmd == BIO_READ) { 547 if (osp == 0) { 548 if (notmapped) { 549 error = md_malloc_move(&m, &ma_offs, 550 sc->sectorsize, NULL, 0, 551 MD_MALLOC_MOVE_ZERO); 552 } else 553 bzero(dst, sc->sectorsize); 554 } else if (osp <= 255) { 555 if (notmapped) { 556 error = md_malloc_move(&m, &ma_offs, 557 sc->sectorsize, NULL, osp, 558 MD_MALLOC_MOVE_FILL); 559 } else 560 memset(dst, osp, sc->sectorsize); 561 } else { 562 if (notmapped) { 563 error = md_malloc_move(&m, &ma_offs, 564 sc->sectorsize, (void *)osp, 0, 565 MD_MALLOC_MOVE_READ); 566 } else { 567 bcopy((void *)osp, dst, sc->sectorsize); 568 cpu_flush_dcache(dst, sc->sectorsize); 569 } 570 } 571 osp = 0; 572 } else if (bp->bio_cmd == BIO_WRITE) { 573 if (sc->flags & MD_COMPRESS) { 574 if (notmapped) { 575 error1 = md_malloc_move(&m, &ma_offs, 576 sc->sectorsize, &uc, 0, 577 MD_MALLOC_MOVE_CMP); 578 i = error1 == 0 ? sc->sectorsize : 0; 579 } else { 580 uc = dst[0]; 581 for (i = 1; i < sc->sectorsize; i++) { 582 if (dst[i] != uc) 583 break; 584 } 585 } 586 } else { 587 i = 0; 588 uc = 0; 589 } 590 if (i == sc->sectorsize) { 591 if (osp != uc) 592 error = s_write(sc->indir, secno, uc); 593 } else { 594 if (osp <= 255) { 595 sp = (uintptr_t)uma_zalloc(sc->uma, 596 md_malloc_wait ? M_WAITOK : 597 M_NOWAIT); 598 if (sp == 0) { 599 error = ENOSPC; 600 break; 601 } 602 if (notmapped) { 603 error = md_malloc_move(&m, 604 &ma_offs, sc->sectorsize, 605 (void *)sp, 0, 606 MD_MALLOC_MOVE_WRITE); 607 } else { 608 bcopy(dst, (void *)sp, 609 sc->sectorsize); 610 } 611 error = s_write(sc->indir, secno, sp); 612 } else { 613 if (notmapped) { 614 error = md_malloc_move(&m, 615 &ma_offs, sc->sectorsize, 616 (void *)osp, 0, 617 MD_MALLOC_MOVE_WRITE); 618 } else { 619 bcopy(dst, (void *)osp, 620 sc->sectorsize); 621 } 622 osp = 0; 623 } 624 } 625 } else { 626 error = EOPNOTSUPP; 627 } 628 if (osp > 255) 629 uma_zfree(sc->uma, (void*)osp); 630 if (error != 0) 631 break; 632 secno++; 633 if (!notmapped) 634 dst += sc->sectorsize; 635 } 636 bp->bio_resid = 0; 637 return (error); 638 } 639 640 static int 641 mdstart_preload(struct md_s *sc, struct bio *bp) 642 { 643 644 switch (bp->bio_cmd) { 645 case BIO_READ: 646 bcopy(sc->pl_ptr + bp->bio_offset, bp->bio_data, 647 bp->bio_length); 648 cpu_flush_dcache(bp->bio_data, bp->bio_length); 649 break; 650 case BIO_WRITE: 651 bcopy(bp->bio_data, sc->pl_ptr + bp->bio_offset, 652 bp->bio_length); 653 break; 654 } 655 bp->bio_resid = 0; 656 return (0); 657 } 658 659 static int 660 mdstart_vnode(struct md_s *sc, struct bio *bp) 661 { 662 int error, vfslocked; 663 struct uio auio; 664 struct iovec aiov; 665 struct mount *mp; 666 struct vnode *vp; 667 struct buf *pb; 668 struct thread *td; 669 off_t end, zerosize; 670 671 switch (bp->bio_cmd) { 672 case BIO_READ: 673 case BIO_WRITE: 674 case BIO_DELETE: 675 case BIO_FLUSH: 676 break; 677 default: 678 return (EOPNOTSUPP); 679 } 680 681 td = curthread; 682 vp = sc->vnode; 683 684 /* 685 * VNODE I/O 686 * 687 * If an error occurs, we set BIO_ERROR but we do not set 688 * B_INVAL because (for a write anyway), the buffer is 689 * still valid. 690 */ 691 692 if (bp->bio_cmd == BIO_FLUSH) { 693 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 694 (void) vn_start_write(vp, &mp, V_WAIT); 695 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 696 error = VOP_FSYNC(vp, MNT_WAIT, td); 697 VOP_UNLOCK(vp, 0); 698 vn_finished_write(mp); 699 VFS_UNLOCK_GIANT(vfslocked); 700 return (error); 701 } 702 703 bzero(&auio, sizeof(auio)); 704 705 /* 706 * Special case for BIO_DELETE. On the surface, this is very 707 * similar to BIO_WRITE, except that we write from our own 708 * fixed-length buffer, so we have to loop. The net result is 709 * that the two cases end up having very little in common. 710 */ 711 if (bp->bio_cmd == BIO_DELETE) { 712 zerosize = ZERO_REGION_SIZE - 713 (ZERO_REGION_SIZE % sc->sectorsize); 714 auio.uio_iov = &aiov; 715 auio.uio_iovcnt = 1; 716 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 717 auio.uio_segflg = UIO_SYSSPACE; 718 auio.uio_rw = UIO_WRITE; 719 auio.uio_td = td; 720 end = bp->bio_offset + bp->bio_length; 721 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 722 (void) vn_start_write(vp, &mp, V_WAIT); 723 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 724 error = 0; 725 while (auio.uio_offset < end) { 726 aiov.iov_base = __DECONST(void *, zero_region); 727 aiov.iov_len = end - auio.uio_offset; 728 if (aiov.iov_len > zerosize) 729 aiov.iov_len = zerosize; 730 auio.uio_resid = aiov.iov_len; 731 error = VOP_WRITE(vp, &auio, 732 sc->flags & MD_ASYNC ? 0 : IO_SYNC, sc->cred); 733 if (error != 0) 734 break; 735 } 736 VOP_UNLOCK(vp, 0); 737 vn_finished_write(mp); 738 bp->bio_resid = end - auio.uio_offset; 739 VFS_UNLOCK_GIANT(vfslocked); 740 return (error); 741 } 742 743 KASSERT(bp->bio_length <= MAXPHYS, ("bio_length %jd", 744 (uintmax_t)bp->bio_length)); 745 if ((bp->bio_flags & BIO_UNMAPPED) == 0) { 746 pb = NULL; 747 aiov.iov_base = bp->bio_data; 748 } else { 749 pb = getpbuf(&md_vnode_pbuf_freecnt); 750 pmap_qenter((vm_offset_t)pb->b_data, bp->bio_ma, bp->bio_ma_n); 751 aiov.iov_base = (void *)((vm_offset_t)pb->b_data + 752 bp->bio_ma_offset); 753 } 754 aiov.iov_len = bp->bio_length; 755 auio.uio_iov = &aiov; 756 auio.uio_iovcnt = 1; 757 auio.uio_offset = (vm_ooffset_t)bp->bio_offset; 758 auio.uio_segflg = UIO_SYSSPACE; 759 if (bp->bio_cmd == BIO_READ) 760 auio.uio_rw = UIO_READ; 761 else if (bp->bio_cmd == BIO_WRITE) 762 auio.uio_rw = UIO_WRITE; 763 else 764 panic("wrong BIO_OP in mdstart_vnode"); 765 auio.uio_resid = bp->bio_length; 766 auio.uio_td = td; 767 /* 768 * When reading set IO_DIRECT to try to avoid double-caching 769 * the data. When writing IO_DIRECT is not optimal. 770 */ 771 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 772 if (bp->bio_cmd == BIO_READ) { 773 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 774 error = VOP_READ(vp, &auio, IO_DIRECT, sc->cred); 775 VOP_UNLOCK(vp, 0); 776 } else { 777 (void) vn_start_write(vp, &mp, V_WAIT); 778 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 779 error = VOP_WRITE(vp, &auio, sc->flags & MD_ASYNC ? 0 : IO_SYNC, 780 sc->cred); 781 VOP_UNLOCK(vp, 0); 782 vn_finished_write(mp); 783 } 784 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 785 pmap_qremove((vm_offset_t)pb->b_data, bp->bio_ma_n); 786 relpbuf(pb, &md_vnode_pbuf_freecnt); 787 } 788 VFS_UNLOCK_GIANT(vfslocked); 789 bp->bio_resid = auio.uio_resid; 790 return (error); 791 } 792 793 static int 794 mdstart_swap(struct md_s *sc, struct bio *bp) 795 { 796 vm_page_t m; 797 u_char *p; 798 vm_pindex_t i, lastp; 799 int rv, ma_offs, offs, len, lastend; 800 801 switch (bp->bio_cmd) { 802 case BIO_READ: 803 case BIO_WRITE: 804 case BIO_DELETE: 805 break; 806 default: 807 return (EOPNOTSUPP); 808 } 809 810 p = bp->bio_data; 811 ma_offs = (bp->bio_flags & BIO_UNMAPPED) == 0 ? 0 : bp->bio_ma_offset; 812 813 /* 814 * offs is the offset at which to start operating on the 815 * next (ie, first) page. lastp is the last page on 816 * which we're going to operate. lastend is the ending 817 * position within that last page (ie, PAGE_SIZE if 818 * we're operating on complete aligned pages). 819 */ 820 offs = bp->bio_offset % PAGE_SIZE; 821 lastp = (bp->bio_offset + bp->bio_length - 1) / PAGE_SIZE; 822 lastend = (bp->bio_offset + bp->bio_length - 1) % PAGE_SIZE + 1; 823 824 rv = VM_PAGER_OK; 825 VM_OBJECT_LOCK(sc->object); 826 vm_object_pip_add(sc->object, 1); 827 for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) { 828 len = ((i == lastp) ? lastend : PAGE_SIZE) - offs; 829 m = vm_page_grab(sc->object, i, VM_ALLOC_NORMAL | 830 VM_ALLOC_RETRY); 831 if (bp->bio_cmd == BIO_READ) { 832 if (m->valid == VM_PAGE_BITS_ALL) 833 rv = VM_PAGER_OK; 834 else 835 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 836 if (rv == VM_PAGER_ERROR) { 837 vm_page_wakeup(m); 838 break; 839 } else if (rv == VM_PAGER_FAIL) { 840 /* 841 * Pager does not have the page. Zero 842 * the allocated page, and mark it as 843 * valid. Do not set dirty, the page 844 * can be recreated if thrown out. 845 */ 846 pmap_zero_page(m); 847 m->valid = VM_PAGE_BITS_ALL; 848 } 849 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 850 pmap_copy_pages(&m, offs, bp->bio_ma, 851 ma_offs, len); 852 } else { 853 physcopyout(VM_PAGE_TO_PHYS(m) + offs, p, len); 854 cpu_flush_dcache(p, len); 855 } 856 } else if (bp->bio_cmd == BIO_WRITE) { 857 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 858 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 859 else 860 rv = VM_PAGER_OK; 861 if (rv == VM_PAGER_ERROR) { 862 vm_page_wakeup(m); 863 break; 864 } 865 if ((bp->bio_flags & BIO_UNMAPPED) != 0) { 866 pmap_copy_pages(bp->bio_ma, ma_offs, &m, 867 offs, len); 868 } else { 869 physcopyin(p, VM_PAGE_TO_PHYS(m) + offs, len); 870 } 871 m->valid = VM_PAGE_BITS_ALL; 872 } else if (bp->bio_cmd == BIO_DELETE) { 873 if (len != PAGE_SIZE && m->valid != VM_PAGE_BITS_ALL) 874 rv = vm_pager_get_pages(sc->object, &m, 1, 0); 875 else 876 rv = VM_PAGER_OK; 877 if (rv == VM_PAGER_ERROR) { 878 vm_page_wakeup(m); 879 break; 880 } 881 if (len != PAGE_SIZE) { 882 pmap_zero_page_area(m, offs, len); 883 vm_page_clear_dirty(m, offs, len); 884 m->valid = VM_PAGE_BITS_ALL; 885 } else 886 vm_pager_page_unswapped(m); 887 } 888 vm_page_wakeup(m); 889 vm_page_lock(m); 890 if (bp->bio_cmd == BIO_DELETE && len == PAGE_SIZE) 891 vm_page_free(m); 892 else 893 vm_page_activate(m); 894 vm_page_unlock(m); 895 if (bp->bio_cmd == BIO_WRITE) 896 vm_page_dirty(m); 897 898 /* Actions on further pages start at offset 0 */ 899 p += PAGE_SIZE - offs; 900 offs = 0; 901 ma_offs += len; 902 } 903 vm_object_pip_subtract(sc->object, 1); 904 VM_OBJECT_UNLOCK(sc->object); 905 return (rv != VM_PAGER_ERROR ? 0 : ENOSPC); 906 } 907 908 static void 909 md_kthread(void *arg) 910 { 911 struct md_s *sc; 912 struct bio *bp; 913 int error; 914 915 sc = arg; 916 thread_lock(curthread); 917 sched_prio(curthread, PRIBIO); 918 thread_unlock(curthread); 919 if (sc->type == MD_VNODE) 920 curthread->td_pflags |= TDP_NORUNNINGBUF; 921 922 for (;;) { 923 mtx_lock(&sc->queue_mtx); 924 if (sc->flags & MD_SHUTDOWN) { 925 sc->flags |= MD_EXITING; 926 mtx_unlock(&sc->queue_mtx); 927 kproc_exit(0); 928 } 929 bp = bioq_takefirst(&sc->bio_queue); 930 if (!bp) { 931 msleep(sc, &sc->queue_mtx, PRIBIO | PDROP, "mdwait", 0); 932 continue; 933 } 934 mtx_unlock(&sc->queue_mtx); 935 if (bp->bio_cmd == BIO_GETATTR) { 936 if ((sc->fwsectors && sc->fwheads && 937 (g_handleattr_int(bp, "GEOM::fwsectors", 938 sc->fwsectors) || 939 g_handleattr_int(bp, "GEOM::fwheads", 940 sc->fwheads))) || 941 g_handleattr_int(bp, "GEOM::candelete", 1)) 942 error = -1; 943 else 944 error = EOPNOTSUPP; 945 } else { 946 error = sc->start(sc, bp); 947 } 948 949 if (error != -1) { 950 bp->bio_completed = bp->bio_length; 951 if ((bp->bio_cmd == BIO_READ) || (bp->bio_cmd == BIO_WRITE)) 952 devstat_end_transaction_bio(sc->devstat, bp); 953 g_io_deliver(bp, error); 954 } 955 } 956 } 957 958 static struct md_s * 959 mdfind(int unit) 960 { 961 struct md_s *sc; 962 963 LIST_FOREACH(sc, &md_softc_list, list) { 964 if (sc->unit == unit) 965 break; 966 } 967 return (sc); 968 } 969 970 static struct md_s * 971 mdnew(int unit, int *errp, enum md_types type) 972 { 973 struct md_s *sc; 974 int error; 975 976 *errp = 0; 977 if (unit == -1) 978 unit = alloc_unr(md_uh); 979 else 980 unit = alloc_unr_specific(md_uh, unit); 981 982 if (unit == -1) { 983 *errp = EBUSY; 984 return (NULL); 985 } 986 987 sc = (struct md_s *)malloc(sizeof *sc, M_MD, M_WAITOK | M_ZERO); 988 sc->type = type; 989 bioq_init(&sc->bio_queue); 990 mtx_init(&sc->queue_mtx, "md bio queue", NULL, MTX_DEF); 991 sc->unit = unit; 992 sprintf(sc->name, "md%d", unit); 993 LIST_INSERT_HEAD(&md_softc_list, sc, list); 994 error = kproc_create(md_kthread, sc, &sc->procp, 0, 0,"%s", sc->name); 995 if (error == 0) 996 return (sc); 997 LIST_REMOVE(sc, list); 998 mtx_destroy(&sc->queue_mtx); 999 free_unr(md_uh, sc->unit); 1000 free(sc, M_MD); 1001 *errp = error; 1002 return (NULL); 1003 } 1004 1005 static void 1006 mdinit(struct md_s *sc) 1007 { 1008 struct g_geom *gp; 1009 struct g_provider *pp; 1010 1011 g_topology_lock(); 1012 gp = g_new_geomf(&g_md_class, "md%d", sc->unit); 1013 gp->softc = sc; 1014 pp = g_new_providerf(gp, "md%d", sc->unit); 1015 pp->mediasize = sc->mediasize; 1016 pp->sectorsize = sc->sectorsize; 1017 switch (sc->type) { 1018 case MD_MALLOC: 1019 case MD_VNODE: 1020 case MD_SWAP: 1021 pp->flags |= G_PF_ACCEPT_UNMAPPED; 1022 break; 1023 case MD_PRELOAD: 1024 break; 1025 } 1026 sc->gp = gp; 1027 sc->pp = pp; 1028 g_error_provider(pp, 0); 1029 g_topology_unlock(); 1030 sc->devstat = devstat_new_entry("md", sc->unit, sc->sectorsize, 1031 DEVSTAT_ALL_SUPPORTED, DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 1032 } 1033 1034 static int 1035 mdcreate_malloc(struct md_s *sc, struct md_ioctl *mdio) 1036 { 1037 uintptr_t sp; 1038 int error; 1039 off_t u; 1040 1041 error = 0; 1042 if (mdio->md_options & ~(MD_AUTOUNIT | MD_COMPRESS | MD_RESERVE)) 1043 return (EINVAL); 1044 if (mdio->md_sectorsize != 0 && !powerof2(mdio->md_sectorsize)) 1045 return (EINVAL); 1046 /* Compression doesn't make sense if we have reserved space */ 1047 if (mdio->md_options & MD_RESERVE) 1048 mdio->md_options &= ~MD_COMPRESS; 1049 if (mdio->md_fwsectors != 0) 1050 sc->fwsectors = mdio->md_fwsectors; 1051 if (mdio->md_fwheads != 0) 1052 sc->fwheads = mdio->md_fwheads; 1053 sc->flags = mdio->md_options & (MD_COMPRESS | MD_FORCE); 1054 sc->indir = dimension(sc->mediasize / sc->sectorsize); 1055 sc->uma = uma_zcreate(sc->name, sc->sectorsize, NULL, NULL, NULL, NULL, 1056 0x1ff, 0); 1057 if (mdio->md_options & MD_RESERVE) { 1058 off_t nsectors; 1059 1060 nsectors = sc->mediasize / sc->sectorsize; 1061 for (u = 0; u < nsectors; u++) { 1062 sp = (uintptr_t)uma_zalloc(sc->uma, (md_malloc_wait ? 1063 M_WAITOK : M_NOWAIT) | M_ZERO); 1064 if (sp != 0) 1065 error = s_write(sc->indir, u, sp); 1066 else 1067 error = ENOMEM; 1068 if (error != 0) 1069 break; 1070 } 1071 } 1072 return (error); 1073 } 1074 1075 1076 static int 1077 mdsetcred(struct md_s *sc, struct ucred *cred) 1078 { 1079 char *tmpbuf; 1080 int error = 0; 1081 1082 /* 1083 * Set credits in our softc 1084 */ 1085 1086 if (sc->cred) 1087 crfree(sc->cred); 1088 sc->cred = crhold(cred); 1089 1090 /* 1091 * Horrible kludge to establish credentials for NFS XXX. 1092 */ 1093 1094 if (sc->vnode) { 1095 struct uio auio; 1096 struct iovec aiov; 1097 1098 tmpbuf = malloc(sc->sectorsize, M_TEMP, M_WAITOK); 1099 bzero(&auio, sizeof(auio)); 1100 1101 aiov.iov_base = tmpbuf; 1102 aiov.iov_len = sc->sectorsize; 1103 auio.uio_iov = &aiov; 1104 auio.uio_iovcnt = 1; 1105 auio.uio_offset = 0; 1106 auio.uio_rw = UIO_READ; 1107 auio.uio_segflg = UIO_SYSSPACE; 1108 auio.uio_resid = aiov.iov_len; 1109 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1110 error = VOP_READ(sc->vnode, &auio, 0, sc->cred); 1111 VOP_UNLOCK(sc->vnode, 0); 1112 free(tmpbuf, M_TEMP); 1113 } 1114 return (error); 1115 } 1116 1117 static int 1118 mdcreate_vnode(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 1119 { 1120 struct vattr vattr; 1121 struct nameidata nd; 1122 char *fname; 1123 int error, flags, vfslocked; 1124 1125 /* 1126 * Kernel-originated requests must have the filename appended 1127 * to the mdio structure to protect against malicious software. 1128 */ 1129 fname = mdio->md_file; 1130 if ((void *)fname != (void *)(mdio + 1)) { 1131 error = copyinstr(fname, sc->file, sizeof(sc->file), NULL); 1132 if (error != 0) 1133 return (error); 1134 } else 1135 strlcpy(sc->file, fname, sizeof(sc->file)); 1136 1137 /* 1138 * If the user specified that this is a read only device, don't 1139 * set the FWRITE mask before trying to open the backing store. 1140 */ 1141 flags = FREAD | ((mdio->md_options & MD_READONLY) ? 0 : FWRITE); 1142 NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, sc->file, td); 1143 error = vn_open(&nd, &flags, 0, NULL); 1144 if (error != 0) 1145 return (error); 1146 vfslocked = NDHASGIANT(&nd); 1147 NDFREE(&nd, NDF_ONLY_PNBUF); 1148 if (nd.ni_vp->v_type != VREG) { 1149 error = EINVAL; 1150 goto bad; 1151 } 1152 error = VOP_GETATTR(nd.ni_vp, &vattr, td->td_ucred); 1153 if (error != 0) 1154 goto bad; 1155 if (VOP_ISLOCKED(nd.ni_vp) != LK_EXCLUSIVE) { 1156 vn_lock(nd.ni_vp, LK_UPGRADE | LK_RETRY); 1157 if (nd.ni_vp->v_iflag & VI_DOOMED) { 1158 /* Forced unmount. */ 1159 error = EBADF; 1160 goto bad; 1161 } 1162 } 1163 nd.ni_vp->v_vflag |= VV_MD; 1164 VOP_UNLOCK(nd.ni_vp, 0); 1165 1166 if (mdio->md_fwsectors != 0) 1167 sc->fwsectors = mdio->md_fwsectors; 1168 if (mdio->md_fwheads != 0) 1169 sc->fwheads = mdio->md_fwheads; 1170 sc->flags = mdio->md_options & (MD_FORCE | MD_ASYNC); 1171 if (!(flags & FWRITE)) 1172 sc->flags |= MD_READONLY; 1173 sc->vnode = nd.ni_vp; 1174 1175 error = mdsetcred(sc, td->td_ucred); 1176 if (error != 0) { 1177 sc->vnode = NULL; 1178 vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY); 1179 nd.ni_vp->v_vflag &= ~VV_MD; 1180 goto bad; 1181 } 1182 VFS_UNLOCK_GIANT(vfslocked); 1183 return (0); 1184 bad: 1185 VOP_UNLOCK(nd.ni_vp, 0); 1186 (void)vn_close(nd.ni_vp, flags, td->td_ucred, td); 1187 VFS_UNLOCK_GIANT(vfslocked); 1188 return (error); 1189 } 1190 1191 static int 1192 mddestroy(struct md_s *sc, struct thread *td) 1193 { 1194 int vfslocked; 1195 1196 if (sc->gp) { 1197 sc->gp->softc = NULL; 1198 g_topology_lock(); 1199 g_wither_geom(sc->gp, ENXIO); 1200 g_topology_unlock(); 1201 sc->gp = NULL; 1202 sc->pp = NULL; 1203 } 1204 if (sc->devstat) { 1205 devstat_remove_entry(sc->devstat); 1206 sc->devstat = NULL; 1207 } 1208 mtx_lock(&sc->queue_mtx); 1209 sc->flags |= MD_SHUTDOWN; 1210 wakeup(sc); 1211 while (!(sc->flags & MD_EXITING)) 1212 msleep(sc->procp, &sc->queue_mtx, PRIBIO, "mddestroy", hz / 10); 1213 mtx_unlock(&sc->queue_mtx); 1214 mtx_destroy(&sc->queue_mtx); 1215 if (sc->vnode != NULL) { 1216 vfslocked = VFS_LOCK_GIANT(sc->vnode->v_mount); 1217 vn_lock(sc->vnode, LK_EXCLUSIVE | LK_RETRY); 1218 sc->vnode->v_vflag &= ~VV_MD; 1219 VOP_UNLOCK(sc->vnode, 0); 1220 (void)vn_close(sc->vnode, sc->flags & MD_READONLY ? 1221 FREAD : (FREAD|FWRITE), sc->cred, td); 1222 VFS_UNLOCK_GIANT(vfslocked); 1223 } 1224 if (sc->cred != NULL) 1225 crfree(sc->cred); 1226 if (sc->object != NULL) 1227 vm_object_deallocate(sc->object); 1228 if (sc->indir) 1229 destroy_indir(sc, sc->indir); 1230 if (sc->uma) 1231 uma_zdestroy(sc->uma); 1232 1233 LIST_REMOVE(sc, list); 1234 free_unr(md_uh, sc->unit); 1235 free(sc, M_MD); 1236 return (0); 1237 } 1238 1239 static int 1240 mdcreate_swap(struct md_s *sc, struct md_ioctl *mdio, struct thread *td) 1241 { 1242 vm_ooffset_t npage; 1243 int error; 1244 1245 /* 1246 * Range check. Disallow negative sizes or any size less then the 1247 * size of a page. Then round to a page. 1248 */ 1249 if (sc->mediasize <= 0 || (sc->mediasize % PAGE_SIZE) != 0) 1250 return (EDOM); 1251 1252 /* 1253 * Allocate an OBJT_SWAP object. 1254 * 1255 * Note the truncation. 1256 */ 1257 1258 npage = mdio->md_mediasize / PAGE_SIZE; 1259 if (mdio->md_fwsectors != 0) 1260 sc->fwsectors = mdio->md_fwsectors; 1261 if (mdio->md_fwheads != 0) 1262 sc->fwheads = mdio->md_fwheads; 1263 sc->object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * npage, 1264 VM_PROT_DEFAULT, 0, td->td_ucred); 1265 if (sc->object == NULL) 1266 return (ENOMEM); 1267 sc->flags = mdio->md_options & MD_FORCE; 1268 if (mdio->md_options & MD_RESERVE) { 1269 if (swap_pager_reserve(sc->object, 0, npage) < 0) { 1270 error = EDOM; 1271 goto finish; 1272 } 1273 } 1274 error = mdsetcred(sc, td->td_ucred); 1275 finish: 1276 if (error != 0) { 1277 vm_object_deallocate(sc->object); 1278 sc->object = NULL; 1279 } 1280 return (error); 1281 } 1282 1283 1284 static int 1285 xmdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1286 { 1287 struct md_ioctl *mdio; 1288 struct md_s *sc; 1289 int error, i; 1290 unsigned sectsize; 1291 1292 if (md_debug) 1293 printf("mdctlioctl(%s %lx %p %x %p)\n", 1294 devtoname(dev), cmd, addr, flags, td); 1295 1296 mdio = (struct md_ioctl *)addr; 1297 if (mdio->md_version != MDIOVERSION) 1298 return (EINVAL); 1299 1300 /* 1301 * We assert the version number in the individual ioctl 1302 * handlers instead of out here because (a) it is possible we 1303 * may add another ioctl in the future which doesn't read an 1304 * mdio, and (b) the correct return value for an unknown ioctl 1305 * is ENOIOCTL, not EINVAL. 1306 */ 1307 error = 0; 1308 switch (cmd) { 1309 case MDIOCATTACH: 1310 switch (mdio->md_type) { 1311 case MD_MALLOC: 1312 case MD_PRELOAD: 1313 case MD_VNODE: 1314 case MD_SWAP: 1315 break; 1316 default: 1317 return (EINVAL); 1318 } 1319 if (mdio->md_sectorsize == 0) 1320 sectsize = DEV_BSIZE; 1321 else 1322 sectsize = mdio->md_sectorsize; 1323 if (sectsize > MAXPHYS || mdio->md_mediasize < sectsize) 1324 return (EINVAL); 1325 if (mdio->md_options & MD_AUTOUNIT) 1326 sc = mdnew(-1, &error, mdio->md_type); 1327 else { 1328 if (mdio->md_unit > INT_MAX) 1329 return (EINVAL); 1330 sc = mdnew(mdio->md_unit, &error, mdio->md_type); 1331 } 1332 if (sc == NULL) 1333 return (error); 1334 if (mdio->md_options & MD_AUTOUNIT) 1335 mdio->md_unit = sc->unit; 1336 sc->mediasize = mdio->md_mediasize; 1337 sc->sectorsize = sectsize; 1338 error = EDOOFUS; 1339 switch (sc->type) { 1340 case MD_MALLOC: 1341 sc->start = mdstart_malloc; 1342 error = mdcreate_malloc(sc, mdio); 1343 break; 1344 case MD_PRELOAD: 1345 /* 1346 * We disallow attaching preloaded memory disks via 1347 * ioctl. Preloaded memory disks are automatically 1348 * attached in g_md_init(). 1349 */ 1350 error = EOPNOTSUPP; 1351 break; 1352 case MD_VNODE: 1353 sc->start = mdstart_vnode; 1354 error = mdcreate_vnode(sc, mdio, td); 1355 break; 1356 case MD_SWAP: 1357 sc->start = mdstart_swap; 1358 error = mdcreate_swap(sc, mdio, td); 1359 break; 1360 } 1361 if (error != 0) { 1362 mddestroy(sc, td); 1363 return (error); 1364 } 1365 1366 /* Prune off any residual fractional sector */ 1367 i = sc->mediasize % sc->sectorsize; 1368 sc->mediasize -= i; 1369 1370 mdinit(sc); 1371 return (0); 1372 case MDIOCDETACH: 1373 if (mdio->md_mediasize != 0 || 1374 (mdio->md_options & ~MD_FORCE) != 0) 1375 return (EINVAL); 1376 1377 sc = mdfind(mdio->md_unit); 1378 if (sc == NULL) 1379 return (ENOENT); 1380 if (sc->opencount != 0 && !(sc->flags & MD_FORCE) && 1381 !(mdio->md_options & MD_FORCE)) 1382 return (EBUSY); 1383 return (mddestroy(sc, td)); 1384 case MDIOCQUERY: 1385 sc = mdfind(mdio->md_unit); 1386 if (sc == NULL) 1387 return (ENOENT); 1388 mdio->md_type = sc->type; 1389 mdio->md_options = sc->flags; 1390 mdio->md_mediasize = sc->mediasize; 1391 mdio->md_sectorsize = sc->sectorsize; 1392 if (sc->type == MD_VNODE) 1393 error = copyout(sc->file, mdio->md_file, 1394 strlen(sc->file) + 1); 1395 return (error); 1396 case MDIOCLIST: 1397 i = 1; 1398 LIST_FOREACH(sc, &md_softc_list, list) { 1399 if (i == MDNPAD - 1) 1400 mdio->md_pad[i] = -1; 1401 else 1402 mdio->md_pad[i++] = sc->unit; 1403 } 1404 mdio->md_pad[0] = i - 1; 1405 return (0); 1406 default: 1407 return (ENOIOCTL); 1408 }; 1409 } 1410 1411 static int 1412 mdctlioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct thread *td) 1413 { 1414 int error; 1415 1416 sx_xlock(&md_sx); 1417 error = xmdctlioctl(dev, cmd, addr, flags, td); 1418 sx_xunlock(&md_sx); 1419 return (error); 1420 } 1421 1422 static void 1423 md_preloaded(u_char *image, size_t length, const char *name) 1424 { 1425 struct md_s *sc; 1426 int error; 1427 1428 sc = mdnew(-1, &error, MD_PRELOAD); 1429 if (sc == NULL) 1430 return; 1431 sc->mediasize = length; 1432 sc->sectorsize = DEV_BSIZE; 1433 sc->pl_ptr = image; 1434 sc->pl_len = length; 1435 sc->start = mdstart_preload; 1436 #ifdef MD_ROOT 1437 if (sc->unit == 0) 1438 rootdevnames[0] = "ufs:/dev/md0"; 1439 #endif 1440 mdinit(sc); 1441 if (name != NULL) { 1442 printf("%s%d: Preloaded image <%s> %zd bytes at %p\n", 1443 MD_NAME, sc->unit, name, length, image); 1444 } 1445 } 1446 1447 static void 1448 g_md_init(struct g_class *mp __unused) 1449 { 1450 caddr_t mod; 1451 u_char *ptr, *name, *type; 1452 unsigned len; 1453 int i; 1454 1455 /* figure out log2(NINDIR) */ 1456 for (i = NINDIR, nshift = -1; i; nshift++) 1457 i >>= 1; 1458 1459 mod = NULL; 1460 sx_init(&md_sx, "MD config lock"); 1461 g_topology_unlock(); 1462 md_uh = new_unrhdr(0, INT_MAX, NULL); 1463 #ifdef MD_ROOT_SIZE 1464 sx_xlock(&md_sx); 1465 md_preloaded(mfs_root.start, sizeof(mfs_root.start), NULL); 1466 sx_xunlock(&md_sx); 1467 #endif 1468 /* XXX: are preload_* static or do they need Giant ? */ 1469 while ((mod = preload_search_next_name(mod)) != NULL) { 1470 name = (char *)preload_search_info(mod, MODINFO_NAME); 1471 if (name == NULL) 1472 continue; 1473 type = (char *)preload_search_info(mod, MODINFO_TYPE); 1474 if (type == NULL) 1475 continue; 1476 if (strcmp(type, "md_image") && strcmp(type, "mfs_root")) 1477 continue; 1478 ptr = preload_fetch_addr(mod); 1479 len = preload_fetch_size(mod); 1480 if (ptr != NULL && len != 0) { 1481 sx_xlock(&md_sx); 1482 md_preloaded(ptr, len, name); 1483 sx_xunlock(&md_sx); 1484 } 1485 } 1486 md_vnode_pbuf_freecnt = nswbuf / 10; 1487 status_dev = make_dev(&mdctl_cdevsw, INT_MAX, UID_ROOT, GID_WHEEL, 1488 0600, MDCTL_NAME); 1489 g_topology_lock(); 1490 } 1491 1492 static void 1493 g_md_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 1494 struct g_consumer *cp __unused, struct g_provider *pp) 1495 { 1496 struct md_s *mp; 1497 char *type; 1498 1499 mp = gp->softc; 1500 if (mp == NULL) 1501 return; 1502 1503 switch (mp->type) { 1504 case MD_MALLOC: 1505 type = "malloc"; 1506 break; 1507 case MD_PRELOAD: 1508 type = "preload"; 1509 break; 1510 case MD_VNODE: 1511 type = "vnode"; 1512 break; 1513 case MD_SWAP: 1514 type = "swap"; 1515 break; 1516 default: 1517 type = "unknown"; 1518 break; 1519 } 1520 1521 if (pp != NULL) { 1522 if (indent == NULL) { 1523 sbuf_printf(sb, " u %d", mp->unit); 1524 sbuf_printf(sb, " s %ju", (uintmax_t) mp->sectorsize); 1525 sbuf_printf(sb, " f %ju", (uintmax_t) mp->fwheads); 1526 sbuf_printf(sb, " fs %ju", (uintmax_t) mp->fwsectors); 1527 sbuf_printf(sb, " l %ju", (uintmax_t) mp->mediasize); 1528 sbuf_printf(sb, " t %s", type); 1529 if (mp->type == MD_VNODE && mp->vnode != NULL) 1530 sbuf_printf(sb, " file %s", mp->file); 1531 } else { 1532 sbuf_printf(sb, "%s<unit>%d</unit>\n", indent, 1533 mp->unit); 1534 sbuf_printf(sb, "%s<sectorsize>%ju</sectorsize>\n", 1535 indent, (uintmax_t) mp->sectorsize); 1536 sbuf_printf(sb, "%s<fwheads>%ju</fwheads>\n", 1537 indent, (uintmax_t) mp->fwheads); 1538 sbuf_printf(sb, "%s<fwsectors>%ju</fwsectors>\n", 1539 indent, (uintmax_t) mp->fwsectors); 1540 sbuf_printf(sb, "%s<length>%ju</length>\n", 1541 indent, (uintmax_t) mp->mediasize); 1542 sbuf_printf(sb, "%s<type>%s</type>\n", indent, 1543 type); 1544 if (mp->type == MD_VNODE && mp->vnode != NULL) { 1545 sbuf_printf(sb, "%s<file>", indent); 1546 g_conf_printf_escaped(sb, "%s", mp->file); 1547 sbuf_printf(sb, "</file>\n"); 1548 } 1549 } 1550 } 1551 } 1552 1553 static void 1554 g_md_fini(struct g_class *mp __unused) 1555 { 1556 1557 sx_destroy(&md_sx); 1558 if (status_dev != NULL) 1559 destroy_dev(status_dev); 1560 delete_unrhdr(md_uh); 1561 }
Cache object: 2023f6735a09128a06627fa1b660b068
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]